A wire of diameter 0.600 mm and length 40.0 m has a measured resistance of 1.40 ohms. What is the resistivity of the wire?
a) 1.12 x 10⁻⁷ Ω·m
b) 2.24 x 10⁻⁷ Ω·m
c) 4.48 x 10⁻⁷ Ω·m
d) 8.96 x 10⁻⁷ Ω·m